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- W2342040574 abstract "Emission-line stars are typically surrounded by dense circumstellar material, often in form of rings or disc-like structures. Line emission from forbidden transitions trace a diversity of density and temperature regimes. Of particular interest are the forbidden lines of [O i] λλ6300, 6364 and [Ca ii] λλ7291, 7324. They arise in complementary, high-density environments, such as the inner-disc regions around B[e] supergiants. To study physical conditions traced by these lines and to investigate how common they are, we initiated a survey of emission-line stars. Here, we focus on a sample of nine B[e] stars in different evolutionary phases. Emission of the [O i] lines is one of the characteristics of B[e] stars. We find that four of the objects display [Ca ii] line emission: for the B[e] supergiants V1478 Cyg and 3 Pup, the kinematics obtained from the [O i] and [Ca ii] line profiles agrees with a Keplerian rotating disc scenario; the forbidden lines of the compact planetary nebula OY Gem display no kinematical broadening beyond spectral resolution; the luminous blue variable candidate V1429 Aql shows no [O i] lines, but the profile of its [Ca ii] lines suggests that the emission originates in its hot, ionized circumbinary disc. As none of the B[e] stars of lower mass displays [Ca ii] line emission, we conclude that these lines are more likely observable in massive stars with dense discs, supporting and strengthening the suggestion that their appearance requires high-density environments." @default.
- W2342040574 created "2016-06-24" @default.
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- W2342040574 creator A5007713904 @default.
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- W2342040574 date "2015-12-23" @default.
- W2342040574 modified "2023-10-14" @default.
- W2342040574 title "Spectroscopic survey of emission-line stars – I. B[e] stars" @default.
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- W2342040574 doi "https://doi.org/10.1093/mnras/stv2758" @default.
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